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-rw-r--r--src/arch/x86/include/arch/cpu.h5
-rw-r--r--src/arch/x86/postcar_loader.c31
2 files changed, 26 insertions, 10 deletions
diff --git a/src/arch/x86/include/arch/cpu.h b/src/arch/x86/include/arch/cpu.h
index a923d8e48e..9c94ab1e8e 100644
--- a/src/arch/x86/include/arch/cpu.h
+++ b/src/arch/x86/include/arch/cpu.h
@@ -271,6 +271,11 @@ struct postcar_frame {
int postcar_frame_init(struct postcar_frame *pcf, size_t stack_size);
/*
+ * Initialize postcar_frame object with a fixed stacktop in low memory.
+ */
+void postcar_frame_init_lowmem(struct postcar_frame *pcf);
+
+/*
* Add variable MTRR covering the provided range with MTRR type.
*/
void postcar_frame_add_mtrr(struct postcar_frame *pcf,
diff --git a/src/arch/x86/postcar_loader.c b/src/arch/x86/postcar_loader.c
index 23f33d556d..287a0d807b 100644
--- a/src/arch/x86/postcar_loader.c
+++ b/src/arch/x86/postcar_loader.c
@@ -33,13 +33,20 @@ static inline void stack_push(struct postcar_frame *pcf, uint32_t val)
*ptr = val;
}
-int postcar_frame_init(struct postcar_frame *pcf, size_t stack_size)
+static void postcar_frame_prepare(struct postcar_frame *pcf)
{
- void *stack;
msr_t msr;
-
msr = rdmsr(MTRR_CAP_MSR);
+ pcf->upper_mask = (1 << (cpu_phys_address_size() - 32)) - 1;
+ pcf->max_var_mttrs = msr.lo & MTRR_CAP_VCNT;
+ pcf->num_var_mttrs = 0;
+}
+
+int postcar_frame_init(struct postcar_frame *pcf, size_t stack_size)
+{
+ void *stack;
+
stack = cbmem_add(CBMEM_ID_ROMSTAGE_RAM_STACK, stack_size);
if (stack == NULL) {
printk(BIOS_ERR, "Couldn't add %zd byte stack in cbmem.\n",
@@ -47,18 +54,22 @@ int postcar_frame_init(struct postcar_frame *pcf, size_t stack_size)
return -1;
}
+ postcar_frame_prepare(pcf);
pcf->stack = (uintptr_t)stack;
pcf->stack += stack_size;
-
- pcf->upper_mask = (1 << (cpu_phys_address_size() - 32)) - 1;
-
- pcf->max_var_mttrs = msr.lo & MTRR_CAP_VCNT;
-
- pcf->num_var_mttrs = 0;
-
return 0;
}
+/*
+ * For use with LATE_CBMEM_INIT boards only, with a fixed stacktop in
+ * low memory.
+ */
+void postcar_frame_init_lowmem(struct postcar_frame *pcf)
+{
+ postcar_frame_prepare(pcf);
+ pcf->stack = CONFIG_RAMTOP;
+}
+
void postcar_frame_add_mtrr(struct postcar_frame *pcf,
uintptr_t addr, size_t size, int type)
{